using System;

using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Math;

namespace Org.BouncyCastle.Crypto.Parameters
{
	public class RsaKeyParameters
		: AsymmetricKeyParameter
	{
		private readonly BigInteger modulus;
		private readonly BigInteger exponent;

		public RsaKeyParameters(
			bool		isPrivate,
			BigInteger	modulus,
			BigInteger	exponent)
			: base(isPrivate)
		{
			if (modulus == null)
				throw new ArgumentNullException("modulus");
			if (exponent == null)
				throw new ArgumentNullException("exponent");
			if (modulus.SignValue <= 0)
				throw new ArgumentException("Not a valid RSA modulus", "modulus");
			if (exponent.SignValue <= 0)
				throw new ArgumentException("Not a valid RSA exponent", "exponent");

			this.modulus = modulus;
			this.exponent = exponent;
		}

		public BigInteger Modulus
		{
			get { return modulus; }
		}

		public BigInteger Exponent
		{
			get { return exponent; }
		}

		public override bool Equals(
			object obj)
		{
			RsaKeyParameters kp = obj as RsaKeyParameters;

			if (kp == null)
			{
				return false;
			}

			return kp.IsPrivate == this.IsPrivate
				&& kp.Modulus.Equals(this.modulus)
				&& kp.Exponent.Equals(this.exponent);
		}

		public override int GetHashCode()
		{
			return modulus.GetHashCode() ^ exponent.GetHashCode() ^ IsPrivate.GetHashCode();
		}
	}
}
